Kwanobuhle, a large township on the outskirts of Uitenhage in the Eastern Cape, had a wastewater treatment works that was long overdue for refurbishment. Projects of this nature are often overlooked, however, given the magnitude of the impact of these works on the community, the decision was taken to refurbish the WWTW. Access to clean water is after all, a basic human need.
Wastewater treatment is a process used to remove contaminants and convert it into an effluent, which can be returned to the water cycle with minimum impact on the environment. In municipalities, this process takes place in water treatment plants, where pollutants are removed and broken down. This recycling plays a vital role in the use and sustainability of scarce resources.
Ibhayi Contracting took on the responsibility of rehabilitating the Kwanobuhle Wastewater treatment plant. The project began in January 2019 and is expected to be completed 18 months later in July 2020.
The rehabilitation process which ordinarily is no easy task, was made simpler using Sika products. The concrete spall repairs on the plant were conducted using two products: SikaTop® Armatec®-110 EpoCem® reinforcing protective coating and the Sika MonoTop®-615 HB high build repair mortar. The latter being a repair and reprofiling mortar for structural concrete. The aerators and digesters were also lined with Sika MonoTop® -612 by trowel application, to reprofile the concrete surfaces. Sikagard®-720 EpoCem®, a protective coating, was subsequently applied as a 2mm thick layer to the Sika MonoTop® -612. Sikagard® -720 EpoCem® is a thin film sealer, made from epoxy and cement-based fillers, used on vertical and horizontal surfaces. It is a unique product that provides concrete protection and acts as a moisture barrier to allow for the rapid application of an epoxy coating onto surfaces with high moisture contents.
Sikagard® -63 N epoxy, a high chemical-resistant coating, with a long track record in wastewater treatment plants, was applied to complete the buildup. Finally, all joints in the structures were sealed with Sikaflex® Pro-3i and Sikadur-Combiflex®.
Given the state of disrepair of the WWTW, it was achieving nowhere near full capacity. Project challenges were inevitable expectations and most, such as labour disputes, were dealt with readily. However, once the digesters and aerators are complete, all would have been achieved to ensure project success. The community of Kwanobuhle can look forward to this redevelopment as it is surely one that will stand the test of time; and is certainly…not a waste.